Advertisements I am going on 3 days now with comcast and stll have not got cable cards working in my series 3. I keep getting a upgrading cable card 1 firmware update and it goes for about an hour than tv comes on for a few seconds and then it stars over. The Tech tried installing 2 cards at once the first time and a no go. Then they brought over two new cards and I insisted on following th instructions exactly. Put in the first card and the host id info screen came on and before we could call the info in the firmware screen came up again and I am stuck in the same loop again. These are SA PKM600 cards. Any suggestions would be appreciated.